It's just a sign of a sore loser or general immaturity,...
Wait, are you seriously suggesting that disliking playing against a strategy in of itself makes you a sore loser or immature?
You... sure those words mean what you think they do?
People can "dislike" whatever they want. If a person becomes upset because of someone else playing the game using a different strategy, that is not a mature reaction.
You dont get to choose which strategy you play against. You get to choose the strategies in the deck you play. If you want to force the other person to play the same type of deck, then you are enforcing your views on them.
Becoming upset at someone because you believe your own personal preferences should override theirs with regard to their own deck is incredibly childish and immature.
Well the thread title says the most already.
I will say directly that I know that many players dont have a problem with them.
But from experience I can say there are also quite a few people who get angry and upset if you play a couple removal- or counterspells and call your deck stupid and all that.
I mean there are people who dislike Thoughtseize and Mono-Black being big players in Standard right now.
I would really like to know whats so bad about creatures dying and stuff. It's part of the game after all.
Because those people dont actually want to play Magic. They want to play some other simpler game that only involves creatures fighting each other.